# The broad and narrow key challenge

## Complete starting source

Pretend bike-card collection: wheel and handlebar drawings both use BIKE. A BIKE request returns both. Its maker keeps that version, then changes the wheel key to WHEEL in another complete version. WHEEL returns its wheel drawing. No riding occurs.

## Day

128

## Extension

If a safe actual broad object is available, distinguish it from its picture.

## Id

X08

## Job

Keep two complete versions and try a broad versus narrow request.

## What this can show

Optional larger practical offer; no complete-year/independent-motor/real audience/progress/translation claim. Local actual curriculum opportunities need professional judgment.

## Materials

Broad scrap cards, thick mark-maker or neutral faithful helper; approved optional device only for actual selected system work. Adult handles any cutting and checks local safety; no small pieces or purchase.

## Notice

Actual first/revised meanings and a job-related keep/change reason stay visible; a different version need not be better.

## Three routes to the same purpose

1. #### Id

D128-R1

#### Target

Actual first/revised meanings and a job-related keep/change reason stay visible; a different version need not be better.

#### Words

Retain a full paper/faithful record, alter one key on another copy, and show every matching entry—including two matches.

2. #### Id

D128-R2

#### Target

Actual first/revised meanings and a job-related keep/change reason stay visible; a different version need not be better.

#### Words

Explicitly choose Version1/Version2 in the later reviewed tool. Compare all eight fields/identities. Restore/replace/clear requires a named choice.

3. #### Id

D128-R3

#### Target

Actual first/revised meanings and a job-related keep/change reason stay visible; a different version need not be better.

#### Words

Direct one change through usual communication; an agreeing helper preserves both complete records and reads their results. Keeping the broad version is valid.

## Next teaching

Keep two complete paper records and change one stated key only. Try broad and narrow requests and invite either version for the chosen job.

## Steps

1. Choose your useful job: Keep two complete versions and try a broad versus narrow request. Keep an own choice before the ordinary worked reasoning.

2. Read the complete starting source and its key. Decide one item representation worth making or directing; a described/tactile record can stand beside paper.

3. Make one item/key entry with an explicit link. Add up to two others only if they serve your chosen job; blank extra places are fine.

4. Try one wanted request and show every match, or state that no matching entry is present. When the job is paper, say paper; record actual device/operator/input/display only where encountered.

5. If useful, retain a whole first record and make one chosen change in a separate record. Compare meanings for the job, rather than praise length, speed or decoration.

6. Choose keep/change/rest/finish. Keep the own record privately or ask a willing reader to try one request; no actual response is invented.

## Title

The broad and narrow key challenge